Setting a Scale/ruler while Zooming or moving the vtkresliceimageviewer data

Yes, I don’t mind if an idea doesn’t get traction as I am not a paying customer and also I should say that I am looking at customizing/extending vtkLegendAnnotationActor when I find time to learn enough c++ to work with the source. When I say this doesn’t work currenlty I mean the default methods included with the class do not offer the customization I am looking for but I am sure the source is extendable enough and my goals can be better achieved by extending the source for my specific use case, plus my use case may be too specific to bake into the maintained supported implementation.